Reland: Minor cleanup in EasyUnlockClient

Reland: Minor cleanup in EasyUnlockClient

BUG=None

(inherit from the original issue)
TBR=stevenjb@chromium.org

Orignial issue description:

>  Minor cleanup in EasyUnlockClient
>
>  * arg names in GenerateEcP256KeyPairCallback typedef were reversed
>  * Make CreateSecureMEssage and UnwrapSecureMessage take structs (instead
>  of having long list of arguments)
>
>  BUG=None
>  TEST=existing unittests
>
>  Review URL: https://codereview.chromium.org/569813002
>
>  Cr-Commit-Position: refs/heads/master@{#294954}

Committed: https://crrev.com/4995985a958df189c529aaeb47d405194ab6622c
Cr-Commit-Position: refs/heads/master@{#295189}

[tbarzic, 2014-09-16 21:46:22]

tbarzic@chromium.org changed reviewers:
+ xiyuan@chromium.org

[tbarzic, 2014-09-16 21:46:23]

xiyuan for
chrome/browser/chromeos/login/easy_unlock/easy_unlock_create_keys_operation.cc

[xiyuan, 2014-09-16 21:48:13]

lgtm

[tbarzic, 2014-09-16 22:54:20]

The CQ bit was checked by tbarzic@chromium.org

[commit-bot: I haz the power, 2014-09-16 22:56:15]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/581463002/20001

[commit-bot: I haz the power, 2014-09-17 00:29:01]

Committed patchset #2 (id:20001) as f3baf066ce16b36528a2d4d14eff0d106224f012

[commit-bot: I haz the power, 2014-09-17 00:29:38]

Patchset 2 (id:??) landed as
https://crrev.com/4995985a958df189c529aaeb47d405194ab6622c
Cr-Commit-Position: refs/heads/master@{#295189}

[tbarzic, 2014-09-26 21:33:18]

Patchset #3 (id:40001) has been deleted